乐都变电站110kV母线谐振现象分析和防范措施

Electromagnetic resonance analysis of 110 kV bus in Ledu Substation and its countermeasures

运行中的电气设备,当系统运行方式发生变化,或者系统出现接地故障时,由于设备自身的工作特点,就会发生铁磁谐振,影响到设备的绝缘寿命,并危及到电网的安全运行。针对乐都变电站110 kV母线在倒闸操作过程中发生的铁磁谐振现象,从理论上进行分析该现象发生的原因,提出防范措施,以保证电气设备正常运行,提高系统供电可靠性,降低设备事故率。并本着安全、经济、可行的原则,理论结合现场实际,提出了在以后操作中避免谐振发生的措施。

When the system changes its operation mode or appears the earthing fault, the electromagnetic resonance will occur in the running electrical equipment because of its own work characteristics, it will affect the insulation life of the equipment and endanger the safe operation of the electrical network. In view of the electromagnetic resonance phenomenon, which generated in switching operating process of the 110 kV bus in Ledu substation, the reason why the phenomenon occurs was analyzed theoretically. Some countermeasures were proposed in order to guarantee the normal operation of the electrical equipment, improve the reliability of power supply and reduce the fault rate of the equipment. Based on the principle of safety, economy and reliability, and the practice with the theory, some countermeasures of how to avoid the occurrence of the electromagnetic resonance in future operation are proposed.